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From: chitrapu.vijayram@gmail.com (Vijay Ram Chitrapu)
To: kernelnewbies@lists.kernelnewbies.org
Subject: question regarding down_interruptible
Date: Mon, 4 Apr 2011 09:57:16 +0530	[thread overview]
Message-ID: <BANLkTinvepf0Ty5uONOZpyKbbyah1nW9jQ@mail.gmail.com> (raw)

Hi Experts,

I have a system in which there is a only 1 user process and a
corresponding kernel module (driver) associated with it to send and
receive data to the user process. In the kernel module, i have a
semaphore to protect a critical section of code during the rx and tx
paths. However, at some instance of code execution, the
down_interruptible returns EINTR, which means that the user process
has received some interrupt due to which the process has come out of
sleep due to the signal it received, due to which the kernel module
has not got the semaphore. At this point of time, i have no idea as to
which signal has triggered the user process to come out of the sleep.
Is there a way in which we can know which signal has a process
received, without registering any user defined handler to it?

Any thoughts/ideas on debugging this problem can be of great help.
Also please correct me if i am wrong in any of my understanding
regarding down_interruptible.

Regards,
Vijay

             reply	other threads:[~2011-04-04  4:27 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-04  4:27 Vijay Ram Chitrapu [this message]
2011-04-04 15:48 ` question regarding down_interruptible Dave Hylands
2011-04-05  3:37   ` Vijay Ram Chitrapu
2011-04-05  6:24     ` Mulyadi Santosa

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